adverb
1. in a physically fierce manner (Freq. 3)
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silence broken by dogs barking ferociously
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they fought fiercely
• Syn: ↑ferociously
• Derived from adjective: ↑fierce, ↑ferocious (for: ↑ferociously)
2. in an emotionally fierce manner
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she was fiercely proud of her children
• Derived from adjective: ↑fierce
Useful english dictionary. 2012.